Organic Light-Emitting Diode Display With Color Filter Layer

Patent metadata

Field	Value
Publication number	US-2016322427-A1
Application number	US-201514862006-A
Country	US
Kind code	A1
Filing date	Sep 22, 2015
Priority date	Apr 28, 2015
Publication date	Nov 3, 2016
Grant date	—

Abstract

A display may have an array of pixels formed from organic light-emitting diodes of different colors. Each organic light-emitting diode may have an anode, a cathode, and an emissive layer between the anode and cathode. To prevent undesired color shifts with off-axis viewing angles, evaporated color filters may be formed on the cathode in alignment with the light-emitting diodes. The color filters may include red color filters that overlap the red diodes but not the green and blue diodes, may include red, blue, and green filters that overlap respective red, green, and blue diodes, or may include an orange filter that overlaps red and green diodes and a blue filter that overlaps blue diodes. The color filters may serve as a capping layer for the diodes or a capping layer that is separate from the color filters can be incorporated into the display.

First claim

1 . A display, comprising:
a substrate; and an array of organic light-emitting diode pixels on the substrate including organic light-emitting diodes of at least first and second colors, wherein the organic light-emitting diodes of the first color have an emissive layer of a first color and an evaporated color filter layer of the first color and wherein the organic light-emitting diodes of the second color have an emissive layer of the second color.

2 . The display defined in claim 1 wherein the organic light-emitting diodes of the first color have a cathode that is interposed between the evaporated color filter layer of the first color and the emissive layer of the first color.

3 . The display defined in claim 2 wherein the first color is red and wherein the evaporated color filter layer comprises a red color filter layer.

4 . The display defined in claim 3 further comprising a clear evaporated capping layer on the organic light-emitting diodes of the second color.

5 . The display defined in claim 1 wherein the organic light-emitting diodes include organic light-emitting diodes of a third color.

6 . The display defined in claim 5 wherein the organic light-emitting diodes of the first color have a cathode that is interposed between the evaporated color filter layer of the first color and the emissive layer of the first color and wherein the organic light-emitting diodes of the second and third colors are covered with a clear evaporated capping layer.

7 . The display defined in claim 5 wherein the organic light-emitting diodes of the first color have a cathode that is interposed between the evaporated color filter layer of the first color and the emissive layer of the first color and wherein the organic light-emitting diodes of the second and third colors are covered with an evaporated color filter layer of a fourth color.

8 . The display defined in claim 7 wherein the first color is blue, wherein the emissive layer of the light-emitting diodes of the first color comprises a blue emissive layer, wherein the evaporated color filter layer of the fourth color comprises an orange color filter layer, wherein the second color is red, and wherein the third color is green.

9 . (canceled)

10 . The display defined in claim 5 wherein the organic light-emitting diodes of the first color have a cathode that is interposed between the evaporated color filter layer of the first color and the emissive layer of the first color and wherein the organic light-emitting diodes of the second and third colors are covered with respective evaporated color filter layers of the second and third colors.

11 . The display defined in claim 5 wherein the organic light-emitting diodes of the first color have a cathode that is interposed between the evaporated color filter layer of the first color and the emissive layer of the first color, the display further comprising a clear capping layer that covers the organic light-emitting diodes of the first, second, and third colors.

12 . The display defined in claim 11 wherein the evaporated color filter of the first color is interposed between the cathode and the clear capping layer.

13 . The display defined in claim 11 wherein the clear capping layer is interposed between the cathode and the evaporated color filter layer of the first color and wherein the first color is red, the second color is green, and the third color is blue.

14 . (canceled)

15 . The display defined in claim 1 wherein the evaporated color filter layer of the first color includes a material selected from the group consisting of: DCM, DCM2, PR254, and PR256.

16 . An organic light-emitting diode display with pixels of first, second, and third colors, comprising:
a substrate; thin-film transistor circuitry on the substrate; a organic light-emitting diode layer on the thin-film transistor circuitry that forms first, second, and third diodes respectively for the pixels of the first, second, and third colors, wherein the first, second, and third diodes include emissive material; a transparent conductive layer that covers the organic light-emitting diode layer; and at least one evaporated color filter layer of the first color that overlaps the first diodes, wherein the transparent conductive layer is interposed between the at least one evaporated color filter layer and the emissive material of the first diodes.

17 . The organic light-emitting diode display defined in claim 16 further comprising a clear capping layer that overlaps the second and third diodes without overlapping the first diodes.

18 . The organic light-emitting diode display defined in claim 16 wherein the first color comprises red, the second color comprises green, and the third color comprises blue and wherein the at least one evaporated color filter layer comprises a red color filter layer that overlaps the first diodes without overlapping the second and third diodes.

19 . The organic light-emitting diode layer defined in claim 16 wherein the at least one evaporated color filter layer forms a capping layer for the first diodes.

20 . An organic light-emitting diode display, comprising:
a substrate; and red light-emitting diodes, green light-emitting diodes, and blue light-emitting diodes formed on the substrate, wherein the red light-emitting diodes include an anode, a red emissive layer, an evaporated red color filter layer, and a cathode between the red emissive layer and the evaporated red color filter layer.

21 . The organic light-emitting diode display defined in claim 20 wherein the evaporated red color filter layer comprises a thermally evaporable material that serves as a capping layer for the red light-emitting diodes and that does not overlap the blue and green light-emitting diodes.

22 . The organic light-emitting diode display defined in claim 20 wherein the evaporated red color filter layer comprises a thermally evaporable red color filter layer, the organic light-emitting diode display further comprising a capping layer, wherein a first portion of the capping layer overlaps the blue and green light-emitting diodes and wherein a second portion of the capping layer is interposed between the evaporated red color filter layer and the cathodes of the red light-emitting diodes.

Assignees

• Apple Inc

Inventors

• Cheon Kwang Ohk
• Liu Rui
• Chen Cheng

Classifications

• H10K59/875

  Arrangements for extracting light from the devices · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/38

  comprising colour filters or colour changing media [CCM] · CPC title

• H10K59/35 Primary

  comprising red-green-blue [RGB] subpixels · CPC title

• H01L51/5036

  Electricity · mapped topic